Actually, Borg has 6 consecutive slam finals between 1980-1981.He might have had 8, had he not skipped the Australian open during all his career ( but 1973).

And between 1978-1981, Borg has 12 slam finals out of 13 played slams, which again might have been 16 slam finals, had he not skipped the Australian Open.

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Borg reached the finals of 11 out of 12 majors in which he appeared between 1978 and 1981, not 12 of 13. He was a great player, but neither he nor anyone else gets credit for what they "might have done" if they had played in certain tournaments which they missed for some reason. That type of speculation only opens the door to fanboys who claim that their heroes would have won twenty or more majors, including multiple CYGS's, if only...

Eleven final appearances in 12 majors played is a remarkable achievement, but still some distance away from Federer's 18 of 19 final appearances in ALL majors played over a given period (Wimbledon 2005 to Australian Open 2010).

I'd have to go with Federer winning two different slams 5 times in a row (US Open from 2004-2008, and Wimbledon from 2003-2007). Then there's Rafa's winning a Masters Series title 8 years in a row (Monte Carlo). But with this upcoming RG, we could see someone win the same Grand Slam 9 times, which would be just outrageous.

I'd have to go with Federer winning two different slams 5 times in a row (US Open from 2004-2008, and Wimbledon from 2003-2007). Then there's Rafa's winning a Masters Series title 8 years in a row (Monte Carlo). But with this upcoming RG, we could see someone win the same Grand Slam 9 times, which would be just outrageous.

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The unbeatable record for Nadal could be At least One grandslam each year for 9 consecutive years.
This is currently a record in any era, any gender.

In fact, Nadal's record will be near immortal since no one ever done in history
of tennis, Open or pre-Open. Long term domination of French Open is extremely
rare. Nadal and Borg are the only ones.

In Open era, 6 year straight domination was the most. In pre-Open era,
Laver, Gonzalez did 7-8 year dominations but the ranking was made by
numbers and surveys. So it must be as good as it gets in entire tennis history.

Okay, maybe highest percentage of sets played. Fed goes much further in tournaments, so even if Isner were to play as many years as Fed he'll never play as many sets. But it does seem as though Isner plays at least one tiebreak per match. So far (third round) in this year's FO 8 of the 11 sets he's played have been been decided by tie break.

Winning one slam 11 times like Court did in Australia? I don't know if it's the least likely to be broken, but as athleticism becomes ever more important in the game I think the chances of it happening become ever more slim.

Winning one slam 11 times like Court did in Australia? I don't know if it's the least likely to be broken, but as athleticism becomes ever more important in the game I think the chances of it happening become ever more slim.